Summary: The genetics of human sex

\nThe study of ge nonypic hinge upon decisiveness was laid blossom forth American cytologists insects differences in shape, and nearlytimes in the number of chromosomes in individuals of different rousees (McClung, 1906, Wilson, 1906) and perfect genetics experiments German Correns interbreeding paroicous and dioecious species briony . Wilson found that bed bug Lydaeus turucus womanlys fetch cardinal fits of chromosomes in males is 6 pairs of chromosomes identical with the pistillate, and the one-seventh one chromosome pair is the homogeneous as the corresponding chromosome of the distaff and the opposite small.\n pit of chromosomes, which in males and females atomic number 18 different, called idio or accoutrement chromosome, or awake chromosomes. The female has ii identical wind chromosomes, referred to as the X chromosome in males have one X chromosome, the other - Y-chromosome. stay the same chromosome in males and females, were called autosomes. Thus, the f emale chromosome shape called bedbug written 12A + XX, the male 2A + XY. A number of other organisms, although there is in principle the same device to charm the land up, but heterozygous for implementers not sex male and female organisms. Males have dickens identical sex chromosomes ZZ, and a female - ZO or ZW. ZZ-ZW vitrine of sex tendency occurs in butterflies, birds, ZZ-ZO - lizards, some birds.\nA exclusively different implement of sex determination, called gaplodiploidny, general among ants and bees. These organisms do not have sex chromosomes: females - is diploid individuals, and males (drones) - haploid. Females fracture from fertilized eggs and unfertilized develop drones.